Treehotel

Harads, Sweden

The newest of the bunch, this architectural treehouse villa just won the Grand Tourism Prize, Sweden's most prestigious travel award. Only five of its 24 rooms are presently available for booking (the rest are still under construction); one resembles a UFO, another a Brobdingnagian bird's nest, and yet another a gleaming mirrored cube. The Scandinavian design emphasizes sustainability: Rooms are outfitted with hydroelectric power, LED lights, and toilets that odorlessly combust or freeze waste; showers are located in a separate unit, as is the tree sauna. Though the closest town has a population of just 600, outdoorsy types will find no shortage of invigorating activities, from hiking and horseback riding to dog sledding and kayaking.